stretch+: we dont use grub

Signed-off-by: Robert Nelson <robertcnelson@gmail.com>

lib/buster-preseed.cfg

@@ -72,6 +72,14 @@ d-i clock-setup/ntp boolean true
 # line to prevent this.
 d-i finish-install/keep-consoles boolean true
 
+### Boot loader installation
+# Grub is the default boot loader (for x86). If you want lilo installed
+# instead, uncomment this:
+d-i grub-installer/skip boolean true
+# To also skip installing lilo, and install no bootloader, uncomment this
+# too:
+d-i lilo-installer/skip boolean true
+
 # Avoid that last message about the install being complete.
 d-i finish-install/reboot_in_progress note
 

lib/stretch-preseed.cfg

@@ -72,6 +72,14 @@ d-i clock-setup/ntp boolean true
 # line to prevent this.
 d-i finish-install/keep-consoles boolean true
 
+### Boot loader installation
+# Grub is the default boot loader (for x86). If you want lilo installed
+# instead, uncomment this:
+d-i grub-installer/skip boolean true
+# To also skip installing lilo, and install no bootloader, uncomment this
+# too:
+d-i lilo-installer/skip boolean true
+
 # Avoid that last message about the install being complete.
 d-i finish-install/reboot_in_progress note